With a large layout, machines spread out across the map, and a plethora of hazards, Unearthly Excavation is arguably one of the most challenging levels in the game.

The map consists of a series of rooms and chambers of varying sizes. The area is divided by two separate locked gates, each requiring a passcode.

The player spawns in a small room containing the level's main Stacking Areas, at the far end of the map. A staircase leads down to a larger room containing the Slosh-O-Matic and a Pit Monster. Another set of stairs leads up to the first Keypad-protected gate. Past this is a large T-shaped hallway containing the Vendor and What A Load Disposal Bins machine. (The Big Banger Supernova can be found here as well.)

The hallway opens into a very large, sunlit circular central chamber surrounding the level's second (and largest) Pit Monster, as well as a spiral staircase leading up to a smaller room with the Incinerator and Punchomatic. Behind a gate in the Incinerator room is a hidden storage room, containing several crates, barrels, mining explosives, two Stacking Areas, and a small closet area behind a door. This closet contains several important items, such as Bob's remains and the Red Keycard. Items in this hidden area are not reflected in the player's score until it is unlocked.

Back in the central chamber, behind another locked gate is a long dirt tunnel branching off and into a large dirt-cavern. This cavern contains the third Pit Monster, an alien structure, and the Alien Artifact.

There are two separate designated areas: yellow and blue. The paint color corresponds to the color of the barrel to be stacked.

NOTE: There are two more hidden stacking zones - one for crates and one for barrels, in the room past the Incinerator. Once found, objects from elsewhere on the map may be stacked there, and objects inside the room may be stacked in the original stacking areas. Both count equally toward the player's score, but the hidden areas are not counted if the player has not yet unlocked the gate.

The number of items incinerated can be found in the code of the player's save file. The player should save his/her game, navigate to his/her save file, open it in Notepad (or TextEdit for iOS), then press CRTL+F and search for NumIncinerated. The proceeding number is how many items have been incinerated during the player's game.

On steps to security gate, next to Slosh-O-Matic: Murdered, Eviscerated, Decapitated, Dismembered, Halved

While you stand with your back to the Slosh-O-Matic, tooth pit to the left, security gate to the right, PID is in the corner in front of you: Murdered, Eviscerated, Decapitated, Dismembered, Halved, Stricken

Between security gate and Vendor, just behind metal post as you walk to the Vendor: Murdered, Eviscerated, Halved, Sliced

From what we've learned so far, we can deduce that it was an item of great importance to the race that left it here.

However, we cannot discern whether it was out of respect for it, or fear.

We are getting some very strange reports about the mental state of the miners who dug out the area. I myself fear that my mental capacity is also dwindling, perhaps I just need a break from studying the artifact.

Most patients exhibit serious symptoms of mental capacital breakdown and psychosis within 72 hours of exposure to the heart of the digsite.

One miner, Mr. Anderson, was able to escape his restraints and run straight into one of the mysterious 'sand traps' that appeared just the other day.

We are not equipped to deal with a medical emergency of any kind. This simply can't go on much longer, I've already had to restrain Mr. Johnson and over 7 other patients to girders, scaffolds, pipes any anything I can!

Unearthly Excavation contains a large alien structure composed of several blue-green segments arranged as a rough archway, found in a large dirt cavern behind the second locked gate. The structure can be seen emitting an occasional electrical spark. The Artifact is found on a pedestal directly beneath the central arch of the structure.

Unearthly Excavation is the only level to contain Pit Monsters, alien hazards that will kill any player who falls into them.

Unearthly Excavation contains many references to the video game "Dead Space", including references to Aegis VII, the planet where "Dead Space" takes place.[1]

There is a hidden warehouse room behind the Incinerator room. It is initially blocked by an inaccessible gate, which can be opened by completing the quest to find Bob. In the warehouse there are many shelves, crates, barrels, mining explosives, and two extra Stacking Areas between the shelves - one for barrels, and one for crates. Along a wall there is a small door, which opens into a broom closet containing three of Bob's last notes, Bob's trunk, the Red Keycard, another collectible, and Bob himself, among several other objects.

The items found in this area are not considered by the game to be "mess" objects, so if the player doesn't find this room it will not count against their completion score.